/Engine/Source/Runtime/Landscape/Classes/Landscape.h
static void SplitHeightmap ( [ULandscapeComponent](API\Runtime\Landscape\ULandscapeComponent) * Comp, [ALandscapeProxy](API\Runtime\Landscape\ALandscapeProxy) * TargetProxy, class [FMaterialUpdateContext](API\Runtime\Engine\FMaterialUpdateContext) * InOutUpdateContext, [TArray](API\Runtime\Core\Containers\TArray)< class [FComponentRecreateRenderStateContext](API\Runtime\Engine\FComponentRecreateRenderStateCon-) > * InOutRecreateRenderStateContext, bool InReregisterComponent )